<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48">
    <path d="M20 40v-12h8v12h10v-16h6l-20-18-20 18h6v16z"/>
    <path d="M0 0h48v48h-48z" fill="none"/>
</svg>
